Eco-worthy 20a MPPT controller
Last month I purchased the Eco-Worthy 20a MPPT controller from their website for $89 plus $24 shipping. Right now it says $102.50 and free shipping. You can see them on ebay with free shipping and if ...
Forum Discussion
The specified standby current is 15 mA. That's probably the night load when buck regulator is off. Specified converter efficiency is > 96%. A 300W module will dissipate 12W within the converter. So we're talking about max 1A loss in charging current when using a 300W panel. Now you're using a 45W panel. Current loss won't scale directly. Perhaps 200mA of the total 1A could be considered regulator quiescent current. The rest of the current (800mA) probably scales. That means current loss within the controller is:
I_loss = 200 mA + 800 mA * (45W/300W) = 320 mA
That's my best guess.
BTW, I'm up the coast from you in Goleta. Today is a great sunny day to run solar tests. Will be looking forward for further results.
Sal
I_loss = 200 mA + 800 mA * (45W/300W) = 320 mA
That's my best guess.
BTW, I'm up the coast from you in Goleta. Today is a great sunny day to run solar tests. Will be looking forward for further results.
Sal
DSchmidt_2000 wrote:
I have not measured quiescent current draw of the unit 'officially' but the clamp on meter which has 10mA resolution is showing 20mA draw during standby/snooze.
Yeah, probably not so great due to me operating it really low in its power handling capability. I do have 2 qty 45W panels though I'm only using one right now, but one of the tests I want to do is compare the charging amps with the panels in parallel vs in series going through the MPPT controller, and also vs in parallel going through a PWM controller or direct to the battery.
